[PATCH 10/19] iommu/amd: Convert to use struct iommu_pages_list

[Jason Gunthorpe <jgg@xxxxxxxxxx>]

Change the internal freelist to use struct iommu_pages_list.

AMD uses the freelist to batch free the entire table during domain
destruction, and to replace table levels with leafs during map.

Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
---
 drivers/iommu/amd/io_pgtable.c | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/drivers/iommu/amd/io_pgtable.c b/drivers/iommu/amd/io_pgtable.c
index f3399087859fd1..e375ddefdb2cde 100644
--- a/drivers/iommu/amd/io_pgtable.c
+++ b/drivers/iommu/amd/io_pgtable.c
@@ -54,14 +54,7 @@ static u64 *first_pte_l7(u64 *pte, unsigned long *page_size,
  *
  ****************************************************************************/
 
-static void free_pt_page(u64 *pt, struct list_head *freelist)
-{
-	struct page *p = virt_to_page(pt);
-
-	list_add_tail(&p->lru, freelist);
-}
-
-static void free_pt_lvl(u64 *pt, struct list_head *freelist, int lvl)
+static void free_pt_lvl(u64 *pt, struct iommu_pages_list *freelist, int lvl)
 {
 	u64 *p;
 	int i;
@@ -84,20 +77,20 @@ static void free_pt_lvl(u64 *pt, struct list_head *freelist, int lvl)
 		if (lvl > 2)
 			free_pt_lvl(p, freelist, lvl - 1);
 		else
-			free_pt_page(p, freelist);
+			iommu_pages_list_add(freelist, p);
 	}
 
-	free_pt_page(pt, freelist);
+	iommu_pages_list_add(freelist, pt);
 }
 
-static void free_sub_pt(u64 *root, int mode, struct list_head *freelist)
+static void free_sub_pt(u64 *root, int mode, struct iommu_pages_list *freelist)
 {
 	switch (mode) {
 	case PAGE_MODE_NONE:
 	case PAGE_MODE_7_LEVEL:
 		break;
 	case PAGE_MODE_1_LEVEL:
-		free_pt_page(root, freelist);
+		iommu_pages_list_add(freelist, root);
 		break;
 	case PAGE_MODE_2_LEVEL:
 	case PAGE_MODE_3_LEVEL:
@@ -306,7 +299,8 @@ static u64 *fetch_pte(struct amd_io_pgtable *pgtable,
 	return pte;
 }
 
-static void free_clear_pte(u64 *pte, u64 pteval, struct list_head *freelist)
+static void free_clear_pte(u64 *pte, u64 pteval,
+			   struct iommu_pages_list *freelist)
 {
 	u64 *pt;
 	int mode;
@@ -335,7 +329,7 @@ static int iommu_v1_map_pages(struct io_pgtable_ops *ops, unsigned long iova,
 			      int prot, gfp_t gfp, size_t *mapped)
 {
 	struct amd_io_pgtable *pgtable = io_pgtable_ops_to_data(ops);
-	LIST_HEAD(freelist);
+	struct iommu_pages_list freelist = IOMMU_PAGES_LIST_INIT(freelist);
 	bool updated = false;
 	u64 __pte, *pte;
 	int ret, i, count;
@@ -360,7 +354,7 @@ static int iommu_v1_map_pages(struct io_pgtable_ops *ops, unsigned long iova,
 		for (i = 0; i < count; ++i)
 			free_clear_pte(&pte[i], pte[i], &freelist);
 
-		if (!list_empty(&freelist))
+		if (!iommu_pages_list_empty(&freelist))
 			updated = true;
 
 		if (count > 1) {
@@ -531,7 +525,7 @@ static int iommu_v1_read_and_clear_dirty(struct io_pgtable_ops *ops,
 static void v1_free_pgtable(struct io_pgtable *iop)
 {
 	struct amd_io_pgtable *pgtable = container_of(iop, struct amd_io_pgtable, pgtbl);
-	LIST_HEAD(freelist);
+	struct iommu_pages_list freelist = IOMMU_PAGES_LIST_INIT(freelist);
 
 	if (pgtable->mode == PAGE_MODE_NONE)
 		return;
-- 
2.43.0